OAKLAND -- A man found dead on an East Oakland sidewalk Monday morning was the city's 28th homicide victim of the 2013, police said.

The man's body was discovered in the 900 block of 90th Avenue, between A and B streets about 6:19 a.m. by a person going to work, police said. It was not immediately known how long the body had been there.

Police said they have no motive for the slaying and have not made any arrests. No suspect information was available, police said.